Channel state information for multiple communication links

Abstract

Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may perform channel state information (CSI) estimation on multiple links (e.g., a Uu link and a sidelink) without excessive power expenditures. The UE may report a CSI processing unit (CPU) capability to a network device. The CPU capability information may include separate CPU capabilities for separate links, or a single CPU capability for multiple links. The network device, the UE, or both, may trigger CSI estimation procedures that do not exceed the reported CPU capability, or may otherwise prioritize CSI estimation procedures based on the CPU capability. The UE may then perform CSI estimation procedures according to one or more rules associated with the CPU capabilities. In some examples, such rules may be explicitly signaled to the UE, or may be included in one or more standard documents.

What is claimed is: 
     
       1. An apparatus for wireless communications at a first user equipment (UE), comprising:
 at least one processor; and 
 memory coupled with the at least one processor, the memory storing instructions executable by the at least one processor to cause the apparatus to:
 communicate with a network device via a first link between the first UE and the network device; 
 communicate with a second UE via a second link between the first UE and the second UE; 
 transmit, to the network device via the first link, an indication of a channel state information (CSI) processing capability for CSI associated with the first link and CSI associated with the second link; and 
 receive, from the network device, an indication of one or more rules for performing CSI estimation procedures, the one or more rules being based at least in part on the CSI processing capability. 
 
 
     
     
       2. The apparatus of  claim 1 , wherein the instructions to transmit the indication of the CSI processing capability are executable by the at least one processor to cause the apparatus to:
 transmit a first CSI processing capability associated with the first link and a second CSI processing capability associated with the second link, the first CSI processing capability indicating a first subset of processing units of a total quantity of processing units, and the second CSI processing capability indicating a second subset of processing units of the total quantity of processing units. 
 
     
     
       3. The apparatus of  claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 perform, according to the CSI processing capability, CSI estimation procedures associated with the first link and CSI estimation procedures associated with the second link; 
 generate a first CSI report for the first link and a second CSI report associated with the second link; and 
 transmit the first CSI report and the second CSI report to the network device via the first link. 
 
     
     
       4. The apparatus of  claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 trigger a first CSI estimation procedure associated with the first link and a second CSI estimation procedure associated with the first link; 
 trigger a third CSI estimation procedure associated with the second link and a fourth CSI estimation procedure associated with the second link; 
 place the first CSI estimation procedure and the second CSI estimation procedure in a first queue for the first link; and 
 place the third CSI estimation procedure and the fourth CSI estimation procedure in a second queue for the second link. 
 
     
     
       5. The apparatus of  claim 4 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 perform the first CSI estimation procedure using a first available processing unit of the first subset of processing units based at least in part on triggering the first CSI estimation procedure before triggering the second CSI estimation procedure; and 
 perform the third CSI estimation procedure using a first available processing unit of the second subset of processing units based at least in part on triggering the third CSI estimation procedure before triggering the second CSI estimation procedure. 
 
     
     
       6. The apparatus of  claim 1 , wherein the instructions to transmit the indication of the CSI processing capability are executable by the at least one processor to cause the apparatus to:
 transmit a CSI processing capability associated with both the first link and the second link, the CSI processing capability indicating a total quantity of processing units for performing CSI estimation procedures on the first link and the second link. 
 
     
     
       7. The apparatus of  claim 6 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 perform, according to the CSI processing capability, CSI estimation procedures associated with the first link and CSI estimation procedures associated with the second link; 
 generate a first CSI report for the first link and a second CSI report associated with the second link; and 
 transmit the first CSI report and the second CSI report to the network device via the first link. 
 
     
     
       8. The apparatus of  claim 6 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 perform, according to the CSI processing capability, CSI estimation procedures associated with the first link and CSI estimation procedures associated with the second link; and 
 allocate resources for the second UE on the second link based at least in part on performing the CSI estimation procedures associated with the first link and CSI estimation procedures associated with the second link. 
 
     
     
       9. The apparatus of  claim 6 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 initiate a first CSI estimation procedure associated with the first link and a second CSI estimation procedure associated with the second link; 
 select the first CSI estimation procedure or the second CSI estimation procedure based at least in part on which of the first CSI estimation procedure and the second CSI estimation procedure is triggered first in time; and 
 perform the selected CSI estimation procedure using a first available processing unit of the total quantity of processing units. 
 
     
     
       10. The apparatus of  claim 6 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 trigger a first CSI estimation procedure associated with the first link and a second CSI estimation procedure associated with the second link; 
 compare a first priority level associated with the first CSI estimation procedure with a second priority level associated with the second CSI estimation procedure; 
 select, based at least in part on the comparing, the first CSI estimation procedure or the second CSI estimation procedure; and 
 perform the selected CSI estimation procedure using a first available processing unit of the total quantity of processing units. 
 
     
     
       11. The apparatus of  claim 10 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 determine, based at least in part on the comparing, that the first priority level and the second priority level are equivalent; and 
 determine, based at least in part on the first priority level and the second priority level being equivalent, which of the first CSI estimation procedure and the second CSI estimation procedure is triggered first in time, wherein using the first available processing unit of the total quantity of processing units to perform the first CSI estimation procedure or the second CSI estimation procedure is based at least in part on determining which of the first CSI estimation procedure and the second CSI estimation procedure is triggered first in time. 
 
     
     
       12. The apparatus of  claim 10 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 trigger a third CSI estimation procedure associated with the first link or the second link, wherein the third CSI estimation procedure is associated with a third priority level; 
 initiate the third CSI estimation procedure using a second available processing unit of the total quantity of processing units; 
 trigger a fourth CSI estimation procedure associated with the first link or the second link, wherein the fourth CSI estimation procedure is associated with a fourth priority level that is higher than the third priority level; 
 release the second available processing unit from the third CSI estimation procedure; and 
 initiate the fourth CSI estimation procedure using the released second available processing unit. 
 
     
     
       13. An apparatus for wireless communications at a network device, comprising:
 at least one processor; and 
 memory coupled with the at least one processor, the memory storing instructions executable by the at least one processor to cause the apparatus to:
 communicate with a first UE via a first link between the network device and the first UE; 
 receive, from the first UE via the first link, an indication of a channel state information (CSI) processing capability of the first UE, for CSI associated with the first link and CSI associated with a second link between the first UE and a second UE; 
 trigger one or more CSI estimation procedures for the first UE, the second UE, or both, based at least in part on receiving the indication of the CSI processing capability; and 
 
 transmit, to the first UE, an indication of one or more rules for performing CSI estimation procedures, the one or more rules being based at least in part on the CSI processing capability. 
 
     
     
       14. The apparatus of  claim 13 , wherein the instructions to receive the indication of the CSI processing capability are executable by the at least one processor to cause the apparatus to:
 receive a first CSI processing capability associated with the first link and a second CSI processing capability associated with the second link, the first CSI processing capability indicating a first subset of processing units of a total quantity of processing units at the first UE, and the second CSI processing capability indicating a second subset of processing units of the total quantity of processing units at the first UE. 
 
     
     
       15. The apparatus of  claim 14 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 receive, from the first UE, a first CSI report associated with the first link and a second CSI report for the second link. 
 
     
     
       16. The apparatus of  claim 14 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 transmit, to the first UE, a first trigger for one or more CSI estimation procedures associated with the first link; and 
 transmit, to the first UE, the second UE, or both, a trigger for one or more CSI estimation procedures associated with the second link. 
 
     
     
       17. The apparatus of  claim 13 , wherein the instructions to receive the indication of the CSI processing capability are executable by the at least one processor to cause the apparatus to:
 receive a CSI processing capability associated with both the first link and the second link, the CSI processing capability indicating a total quantity of processing units for performing, by the first UE, CSI estimation procedures on the first link and the second link. 
 
     
     
       18. The apparatus of  claim 17 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:
 receive, from the first UE based at least in part on the CSI processing capability, a first CSI report for the first link and a second CSI report for the second link. 
 
     
     
       19. A method for wireless communications at a first user equipment (UE), comprising:
 communicating with a network device via a first link between the first UE and the network device; 
 communicating with a second UE via a second link between the first UE and the second UE; 
 transmitting, to the network device via the first link, an indication of a channel state information (CSI) processing capability for CSI associated with the first link and CSI associated with the second link; and 
 receiving, from the network device, an indication of one or more rules for performing CSI estimation procedures, the one or more rules being based at least in part on the CSI processing capability. 
 
     
     
       20. The method of  claim 19 , wherein transmitting the indication of the CSI processing capability comprises:
 transmitting a first CSI processing capability associated with the first link and a second CSI processing capability associated with the second link, the first CSI processing capability indicating a first subset of processing units of a total quantity of processing units, and the second CSI processing capability indicating a second subset of processing units of the total quantity of processing units. 
 
     
     
       21. The method of  claim 19 , wherein transmitting the indication of the CSI processing capability comprises:
 transmitting a CSI processing capability associated with both the first link and the second link, the CSI processing capability indicating a total quantity of processing units for performing CSI estimation procedures on the first link and the second link. 
 
     
     
       22. A method for wireless communications at a network device, comprising:
 communicating with a first UE via a first link between the network device and the first UE; 
 receiving, from the first UE via the first link, an indication of a channel state information (CSI) processing capability of the first UE, for CSI associated with the first link and CSI associated with a second link between the first UE and a second UE; 
 triggering one or more CSI estimation procedures for the first UE, the second UE, or both, based at least in part on receiving the indication of the CSI processing capability; and 
 transmitting, to the first UE, an indication of one or more rules for performing CSI estimation procedures, the one or more rules being based at least in part on the CSI processing capability. 
 
     
     
       23. The method of  claim 22 , wherein receiving the indication of the CSI processing capability comprises:
 receiving a first CSI processing capability associated with the first link and a second CSI processing capability associated with the second link, the first CSI processing capability indicating a first subset of processing units of a total quantity of processing units at the first UE, and the second CSI processing capability indicating a second subset of processing units of the total quantity of processing units at the first UE. 
 
     
     
       24. The method of  claim 22 , wherein receiving the indication of the CSI processing capability comprises:
 receiving a CSI processing capability associated with both the first link and the second link, the CSI processing capability indicating a total quantity of processing units for performing, by the first UE, CSI estimation procedures on the first link and the second link.